Seller notes

FREE SHIPPING IN CONTINENTAL US All two seat Yaks ( 52/54) plus the Yak 18-T use this large piston in the Pressure Relief Valve. ( Yak 50, Yak 55 and Yak 52TW use the SMALLER diameter PRV Piston that does not have a saddle ) The hex nut on the PRV (Yak 52 shown) - controls the pneumatic system pressure by adjusting a compression spring. That force is on this Piston 24/7 so eventually the rubber slug in the face will take a set  -  at which time it may not seal as well as a new one. A great pla...

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